Monotelephone-relay.



P.l HEINA.- A MONOTELEPHNE RELAY. PPLIUATION FILED 13.36.22, 1910,

- Patented Jan. 9, 1912.

s *i V' W/fA/Essfs l //V VFA/ 70?? UNITED STATES PATENT FFICE,

PAUL HEINA, oF PARIS, FRANCE, AssIcfNoR mo sT nns TLGRAPHES MULTIPLEX, (SYSTEM E. MERCADIERJ or PARIS, FRANCE.

MONOTELEPHONE-RELAY.

spebincamn of Letters Patent.

PatenteaJaae, 1912.

Application led December 22, 1910. Serial No. 598,702.

To all whom 'it may concern:

Be it known that I, PAUL HEINA, a citizen of France, -residing at Paris, in the said Republic, have invented new and useful Improvements in Monotelephone-Relays, of which the following is a specication.

This invention relates to modifications in 'the mono-telephone relay forming the subject matter of United States Patent No.

930,753, two of these modifications'relating vto the apparatus itself and a third to its operation.

The first'modiiication consists in increasing the magnetic damping of the plate of the relay when the latter is used for receiving short emissions.

In the accompanying drawings, Figure l is a side elevation and Fig. 2 a plan of the mono-telephone-relay having the modifica- -tions forming the subject matter of the resshire iron annealed with wood and mounted on the shoulder of a conical piece of brass c. Above thel shoulder, the piece of brass extends through the steel plate a and receives 4the squared nut of brass or steel al for keeping the armature at the center of the plate. A nut e of hexagonal form and hav-I lng a plain surface surmounts the nut d,

anda small plate f of a conducting and nonoxidizable alloy, such' as an alloy of silver and platinum, is soldered to the nut e. This construction of the plate nis for the purpose of obtaining maximum sensitiveness as Well as rapid movement and rapid damping. In a plate thus constructed the acoustic characteristic constants of the relay given by the plate and the magnetic charac- `teristic constants of -the relay given by the soft iron armature may be varied so as to separate the functions.

The relay is characterized, firstly by the acoustic constants which depend upon the dimensions of the vibration plate a, and secondlv. by the magnetic constants which depend` upon the dimension of the soft armature b; In other words, these constants define the relay very effectively, since experience has shown: that in a given circular diaphragm, vibrating for the first sound harmonic and having an armature with the said the contact surface of whic diaphragm is -a circle with a radius of less or at the most 3% mm., the `correspondin nodal line will be a circle, the 'diameter o which is smallerV than 68/100 of the diameter of the diaphragm. For instance, with a vibrating diaphragm of a diameter of IOOmm., the nodal line will have a diameter of less than 68 mm. This diameter depends lupon the weight of the armature and dlminishes in proportiont'o the latter, but is subject to the following rule: The weight Pe of that part of the diaphragm which lies outside of the nodal line, and the wei ht Piv of that part of the diaphragm whic lies inside said line, are in a constant proportionl equal to Pe y Pi n.162. It is always possible to arrange an arma'- ture on a plate. The nodal line of the same in the irst harmonic will be a perfect circle, under conditions stated above, that fis when the surface of contact is a circle with a radius of not more than 3-5 mm. It is always possible to figure out the diameter of the line, when the :weight of the plate 'without the armature and the weight of the armature are known, by recalling that the exterior and interior parts of then'odal line are always in the ratio-1, 162.

To adjust the plate a and the magnet parallel to each other there are screw threaded rods c fixed in the lmovable platform c of the apparatus. These rods extendthrough the plate a and on them workI nuts'u. Between each nutand the plate is threaded on the rod a curved prism t, the lm'ife edge of' which is in contactwith the surface of the plate and the curvature of which is struck from the center of the plate. By adjusting ymorel or less the nuts u on the threaded rods, the desired \parallel position is obtained.

The second modification relates to the arrangement of the lever g whichA is applied to the small plate f. This levler is centered on the standard?)l and at theend of its longer arm carries a pieceZ in which is mounted a plate k having a knife edge and of the same metal as the plate f; ig. 3 shows a front elevation of the piece Z. The shorter 'arm of the lever carries a screwthreaded rodl j on which work nuts z' constituting counterweights. mis a screw for adjusting the height of the lever g and n n are screws for adjusting the orientation of the .lever which is carried,- as was described in the specification to United States Patent No. 930,753, in jeweled bearings designed to limit lateral play. The longer arm of the lever comprises three parts, (l) the arm itself, g, which is a cylindrical metal rod; (2)l the cylindrical conical piece of metal Z mounted 'with'light friction onthe arm g, and (3) plate f: rivyeted to the end of the piece Z and of the same alloy as the plate f; this plate is ground to a knife edge, being for the purpose of obtaining as intimate a contact as possibleybetween the knife and the plate. The grinding and polishing of these parts is performed with greatest care. v .i

The third modilication is for the purpose of avoiding deterioration of these contacts owing to production of sparks due-'to tariation of intensity and consists in diminishing the e'ects due to self-induction which are produced in the circuit by application of a condenser, as 'shown diagrammatically in Fig. 5. The condenser is in shunt to the variable contact and the continuous current relay is provided with double windings, one of which is used for actuating the apparatus y Awhile the other is short-circuited onvitself kso as to diminish the self-induction of the winding traversed by the current, thisarrangement. producing an eifect complementary to that of the condensen The maintenance of the knife edge lo and .the plate f parallel to each other may be secured by one or other of the following methods. (a). Byk turning the piece Z on the arm g, which can easily be done by careful adjustment of the screw s (Fig. 3). (b). By Ameans of a metal piece g, which maybe called a stirrup, mounted with considerable friction or ixed by a screw jp on the arm g. This piece g carries two tine adjustmentjscrews r (Figs. l, 2 and l) between which the piece Z is placed so that by turning one or other of these screws the position of the knife la in respect tothe plate can be minutely adjusted. lThe apparatus thus constructed acts as amonophone plate of great magnetic damping, particularly applicable for very short emissions, such as those of wireless telegraphy..

vlHaving nowparticularly described and ascertained the nature of the said invention and in what .manner the same is to be performed, I declare that what l claim is:

A Vmonotelephone relay comprising a plate of variable acoustic and magnetic properties and of great magnetic damping, an `armature of soft iron of geometrical form assuring the general symmetry of the ensembZe of plate and armature and devoid of all magnetism placed at the center of and at a certain distance from the said plate, a lever carrying at its .end a knife made of an alloy whichis a good conductor of electricity land non-oxidizable, a plate of like alloy, mounted on the rst-named plate, and adapted to receive the said knife `in contact with it and an electric circuit vconnecting the monotelephone relay with a continuous current relay comprising a source of continuous current, double windings one of which'is used foractuating the printing apparatus, while the other is short circuited on itself, and a condenser shunted across the plate and the lever ofthe monophone relay.

In testimony whereof I have signed my name t-o this specification in the presence of two subscribing witnesses.

I PAUL HEINA- Witnesses:

JULES FAYoLfrn'r, Pinnen Fossann. 

